A note on the name: the "BS Vegan" in Arizona BS Vegan designates the Birkenstock Soft Footbed version of the iconic Arizona crafted entirely from vegan, animal-free materials — combining the brand's plushest footbed construction with a cruelty-free Birko-Flor upper. An icon of timeless design and legendary comfort that has been defining style since 1973, this Arizona delivers the same laid-back, two-strap silhouette in a durable, leather-like vegan finish that looks classic while remaining easy to care for and gentle on the skin. The upper is crafted from Birko-Flor — a high-quality synthetic material lined on the inside with a soft, breathable fleece layer that is durable, hygienic, water-resistant, and remarkably comfortable against the foot. The defining feature of the Soft Footbed con.